Electrically-operated clock



Aug. 14, 1928. 1,680,700

' M. A. STA NDOW ELECTRICALLY OPERATED CLOCK Filed Aug. 21, 1925 2Sheets-Sheet 1 UHHIIHI M. A. STANDOW ELECTRICALLY OPERATED CLOCK 2Sheets-Sheet Filed Aug. 21, 1925 INVENTOR: I

PATENT oFFics;

' MARK A. STANDOW, O1 NEWARK, NEW JERSEY.

ELECTBIGALLY-OPERATED CLOCK.

ap ucaaonnedau ust 21, 1925. stem 7K0. 51,571.

The present invention relates to an improved clock which is of the typethat is electricallygoperated and that embodies a magnetic actuatingunit that automatically operates to make and break the circuit actuatingthe magnet so that an intermittent ap plication of electric poweroperates the unit and this intern operates an ordinary clock train, thethus replacing the spring of In an ordinary clock.

The invention resides in certain details of construction which aresimple in their operation and which occupy but a small space, thusmaking the clock applicable for auto- ?lt mobiles and similar uses andin which the 20 section through the casing as tion on line 44 inFigure 1. Figure 5 is a so 9 is a perspective view of the armature ofback view of the device. Figure 6 is a section on line 66 in Figure 1.Figure 7 is a section on line 77 in Figure 1. Figure 8 is a RClZlOD online 8-8 in Figure 1. Figure the magnet and Figure 10 is a perspectiveview of a swinging contact of the make and lbreak device.

The drawing illustrates a casing 10 which is usually cylindrical andwhich contains the frame of the magnetic unit, the frame comprisingparallel plates 11 and 12 which act to support by the cross piece 13 thecoils 14 4 of the magnets which are of the usual type containing coreswhich, when energized, at-

tract the armature 15 which is pivoted at 16. The armature 15 is thusswung in one direction by the energized coils and is pulled in the otherdirection by a spring 17 which abuts on the ear 18 on the plate 11 andabuts on the nut 19 which fits on the screw-threaded end 20 of the stem21 which is pivoted to the arm 22 of the stirrup 23 which is fastened tothe armature, the other arm 24 of the stirrup carrying a pawl 25 whichis pressed by the spring 26 into engagement with the ratchet 27 on theshaft 28. The retaining pawl .29 holds the ratchet 27 against reversemovement.

It will be seen that an intermittent energizing of the magnets willcause the armature to rock back and forth and thus ad-' Vance theratchet 27 by means of the spring 17. To make this intermittent movementrelatively steady in the clock train, I connect the clock train, whichcan be mounted in the casing 30 and which is not shown in detail, byhaving on the shaft 28 the arms 31 and opposite the arms 31 aresimilararms 32 on the shaft for the clock train, the extremities ofthese arms being connected by the coiled springs 33 so that enoughcushioned tension is provided to make the movement/of the clock trainsteady.

The pawl 25 is made of a sheet of metal bent up to form side pieces thatflank, as at' 34, the ratchet 27 thus holding it in align ment. sheet ofmetal connecting a cross-portion 35 which forms a tooth for engaging theteeth of the ratchet and preferably also comprising a roller 36 whichacts as an abutment for the spring 26.

The circuit is intermittently made and broken by a device, actuated fromthe armature, being pressed down to break the circuit when the armatureis attracted by the magnet and being released or tripped to close thecircuit when the spring 17 overcomes the influence of the magnet.

The make and break device consists of a fixed contact 37 mounted on theextension 38 of the plate 11 and the movable contact 39 is on the arm 40of the lever 41' which is in the form of a bell crank with an ear 42extending beyond the pivotal point 43 of the lever 41. The lever 41 isin the path of the finger 44 of the armature so that when the armatureis down against the magnet, it pushes down on the arm 45 of the lever 41which causes it to snap over the catch 46 which is pivoted at 47 and hasan ear 48 connected by the spring 49 with the car 42 and also has anextension 50 which is in the path of the adjustable tripping finger 51fastened to the extension 52 of the .armature 15.

It will thus be evident that when the circuit is broken the spring 17moves the armature so that it swings up, the finger 51 trips the catch46, the spring 49 moves the contact arm 39- and the contacts 37 and 38are brought together and the circuit is closed. This energizes themagnet as the current enters from any suitable source of supply by thewire 53, passes through the coils, through the Wire 54 from the coils tothe The pawl is thus made from a single movable contact, and by the wire55, from the fixed contact to a suitable return wire or is grounded.

This intermittent movement keeps the springs 33 under a constant tensionvarying s 1,, this of course, being taken up by the balance wheel or itsequivalent, in the clock-train.

I claim:

An electric driving mechanism for a clock train comprising a frame, a.magnetic coil, an armature pivoted at one side of the coil, extendingacross said coil and having a tripping finger at its free end and atransverse finger on the side thereof, a stirru secured on the armature,a spring to yield ingly inhtly at the operation of the armature,

fluence one end of the stirrup, a pawl carried by the other end of thestirrup, a ratchet actuated by the pawl and connected to the clocktrain, a fixed contact on the frame, a movable contact pivoted on theframe with an arm to engage the fixed contact and a lever under thetransverse finger of the armature, a catch pivoted on the frame andadapted to engage the arm of the movable contact and having an extensionto be trippedby the tripping finger of the armature, an ear on themovable contact, an car on the catch, and a s ring connecting the ears.

n testimony whereof I aflix my signature.

MARK A. STANDOW.

